Merry Christmas and Happy New Year 2021! New Year! Take your smartphone vertically and incline it a little. The garlands are controlled by the acceleration sensor components x and z (© mIv 2020). NY! green z left right h x1 x2 Ax Az sx sz Sx Sz Ax Az 0 4 101 z 0 4 51 h z right -1 right left h Ax x1 h Az x2 Ax sx Az sz Sx sx Sx Sz sz Sz x1 h x2 h left z right z Sx Sz