ELI5 Escalators - what are the side brushes for?

Why does it feel so strange to step onto a stationary escalator? What do the brush type things on the side of escalators do? Why are escalator steps jagged with the brushlike shape at the top and bottom? Why do escalator handrails often run at slightly different speeds than the steps? Why does it feel so strange to step onto a stationary escalator? ... we explain like I'm five Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: ferdinand00, v0kun, banauuuuh, teddyjules, rashikun, south5, ac7ss, voltenic and aptom203 To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]