Supplementary Videos

Supplementary video S1: 128 microtubule bundles (length 16) with kinesin walkers in a circular geometry in a fluid chamber with k_oseen=0.1, chamber height H=1.0, k_stiff=10.

Supplementary video S2: 128 microtubule bundles (length 16) with kinesin walkers in a circular geometry in a fluid chamber with k_oseen=0.2, chamber height H=0.1, k_stiff=10.

Supplementary video S3: 128 microtubule bundles (length 16) with kinesin walkers in a circular geometry in a fluid chamber with k_oseen=0.2, chamber height H=0.2, k_stiff=10.

Supplementary video S4: 128 microtubule bundles (length 16) with kinesin walkers in a circular geometry in a fluid chamber with k_oseen=0.2, chamber height H=0.5, k_stiff=10.

Supplementary video S5: 128 microtubule bundles (length 16) with kinesin walkers in a circular geometry in a fluid chamber with k_oseen=0.2, chamber height H=1.0, k_stiff=10.

Supplementary video S6: 128 microtubule bundles (length 16) with kinesin walkers in a circular geometry in a fluid chamber with k_oseen=0.3, chamber height H=1.0, k_stiff=10.

Supplementary video S7: 128 microtubule bundles (length 16) with kinesin walkers in a planar geometry in a fluid chamber with k_oseen=0.1, chamber height H=1.0, k_stiff=5.

Supplementary video S8: 128 microtubule bundles (length 16) with kinesin walkers in a planar geometry in a fluid chamber with k_oseen=0.1, chamber height H=1.0, k_stiff=10.

Supplementary video S9: 128 microtubule bundles (length 16) with kinesin walkers in a planar geometry in a fluid chamber with k_oseen=0.1, chamber height H=1.0, k_stiff=15.

Supplementary video S10: 128 microtubule bundles (length 16) with kinesin walkers in a planar geometry in a fluid chamber with k_oseen=0.1, chamber height H=1.0, k_stiff=20.

Supplementary video S11: 2 microtubules of opposite polarities, green MT's have minus ends on surface, and blue MT's have plus ends on the surface. There are fixed boundary conditions on the surface. This shows a simulation for a set of parameters where the two microtubules move. This behavior was never found when there were more than 2 microtubules in a bundle.

Supplementary video S12: Pillar of 9 microtubules of opposite polarities, green MT's have minus ends on surface, and blue MT's have plus ends on the surface. There are sliding boundary conditions on the surface. This shows a simulation in a regime with sufficiently weak attractive interactions, f_a=1, where there is a twisting motion inside the pillar but then the minus microtubules suddenly slide off of the plus ones, finally lying close to parallel with the plane of attachment.