Castle Tower Voxels

import matplotlib.pyplot as plt
import numpy as np

n = 15
voxels = np.zeros((n, n, n), dtype=bool)

# Create staircase
for i in range(n):
    step_height = i
    if step_height < n:
        voxels[i, :3, :step_height+1] = True

# Gradient from mint #27F5B0 to lime #6CF527
z_idx = np.indices((n, n, n))[2]
colors = np.empty(voxels.shape + (4,), dtype=np.float32)
colors[..., 3] = 0

norm_z = z_idx / (n - 1)
# 27F5B0 -> 6CF527
colors[voxels, 0] = 0.15 + 0.27 * norm_z[voxels]  # 27 to 6C
colors[voxels, 1] = 0.96  # F5 (constant)
colors[voxels, 2] = 0.69 - 0.54 * norm_z[voxels]  # B0 to 27
colors[voxels, 3] = 0.9

fig = plt.figure(figsize=(10, 8), facecolor='#020B14')
ax = fig.add_subplot(111, projection='3d', facecolor='#020B14')

ax.voxels(voxels, facecolors=colors, edgecolors='#1e293b', linewidth=0.3)

ax.set_xlabel('X', fontsize=11, color='#94a3b8', labelpad=10)
ax.set_ylabel('Y', fontsize=11, color='#94a3b8', labelpad=10)
ax.set_zlabel('Z', fontsize=11, color='#94a3b8', labelpad=10)
ax.set_title('Staircase Voxels', fontsize=14, color='white', fontweight='bold', pad=20)

ax.tick_params(colors='#64748b', labelsize=8)
ax.xaxis.pane.fill = False
ax.yaxis.pane.fill = False
ax.zaxis.pane.fill = False
ax.xaxis.pane.set_edgecolor('#1e293b')
ax.yaxis.pane.set_edgecolor('#1e293b')
ax.zaxis.pane.set_edgecolor('#1e293b')
ax.grid(True, alpha=0.2, color='#475569')

plt.tight_layout()
plt.show()